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Program.cs
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Program.cs
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using System;
using System.Collections.Generic;
namespace CountCompleteTreeNodes
{
public class TreeNode
{
public int val;
public TreeNode left;
public TreeNode right;
public TreeNode(int x) { val = x; }
}
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Hello World!");
}
static int CountNodes_BFS(TreeNode root)
{
if (root == null) return 0;
var queue = new Queue<TreeNode>();
queue.Enqueue(root);
int count = 0;
while (queue.Count != 0)
{
var cur = queue.Dequeue();
count++;
if(cur.left != null) queue.Enqueue(cur.left);
if(cur.right != null) queue.Enqueue(cur.right);
}
return count;
}
static int CountNodes_DFS(TreeNode root)
{
return DFS(root);
}
static int DFS(TreeNode node)
{
if (node == null) return 0;
return DFS(node.left) + DFS(node.right) + 1;
}
}
}